NORRISTOWN ­­— An East Greenville man wants to withdraw his previous guilty plea to charges he sexually assaulted a blind woman when he visited her Marlborough home.

Donald Trumbauer, 64, of the 400 block of Main Street, in papers filed in Montgomery County Court, sought permission from a judge to withdraw his Aug. 20, 2012, guilty plea to a felony charge of aggravated indecent assault. Defense lawyer Adam Sager, who filed the papers on Trumbauer’s behalf, indicated the withdrawal will allow Trumbauer “to proceed with a trial before a jury” in connection with incidents prosecutors alleged occurred between March and July 2011 while Trumbauer visited the woman’s Marlborough residence.

Judge William R. Carpenter, who took Trumbauer’s plea last August, has not yet scheduled a hearing on the request. Prosecutors will have a chance to address the request at a future hearing.

With his original plea, Trumbauer admitted that he sexually assaulted the woman and that the sexual contact between him and the victim was without the victim’s consent. At that time, Carpenter deferred sentencing so that court officials could complete a background investigative report about Trumbauer, who had faced five to 10 years in prison on the charge.

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At trial, Trumbauer would also face charges of rape, involuntary deviate sexual intercourse, sexual assault, indecent assault and harassment in connection with the alleged incidents.

With the charges, Assistant District Attorney Matthew Quigg alleged Trumbauer violated the victim’s sense of security and exploited the woman’s disability to satisfy his own sexual gratification.

An investigation of Trumbauer began in July 2011 when the 52-year-old woman, who is legally blind, contacted Marlborough police to report that she had been sexually assaulted by Trumbauer, according to the criminal complaint.

The woman told police she met Trumbauer through her former roommate and that Trumbauer often visited her Marlborough residence, along with his wife and the former roommate, while she was recuperating from a medical condition. Trumbauer, the woman told police, “would make comments about wanting to touch and feel” intimate parts of her body during those visits, according to the arrest affidavit.

Between March and July 2011, Trumbauer touched the woman in an indecent manner during the visits while his wife and the victim’s former roommate were in other areas of the residence, according to the arrest affidavit filed by Marlborough Police Officer Darren Morgan.

The woman reported to police “that she told (Trumbauer) to stop, leave me alone, I don’t feel good, I’m not up to this, but he did not stop,” Morgan alleged.

Police alleged Trumbauer’s conduct escalated in July when he undressed the woman and had sexual contact with her without her consent.

“(The woman) stated she asked Donald to leave because she did not feel good and she did not want him to touch her,” Morgan alleged in the criminal complaint. “(The woman) reported that she told Donald that she could not do this, that she felt like she was going to get sick.”

Police alleged that despite the woman’s resistance, Trumbauer persisted with the assault.